NPR-PPR Composite Propeller Blades for Impact Resistance
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Solution Overview
Problem
Conventional propeller materials lack the necessary strength, durability, and impact resistance, particularly when exposed to debris, leading to potential damage and reduced operational efficiency.
Innovation Solution
The use of negative Poisson's ratio (NPR) materials in combination with positive Poisson's ratio (PPR) materials, forming a composite Boolean-Park (B-P) material, which is used to create propellers with enhanced strength, flexibility, and impact resistance by incorporating NPR materials in the blades and hub, and alternating layers or matrices with PPR materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional positive Poisson's ratio (PPR) materials are used for propeller blades, then the propeller can be manufactured with traditional materials, but the propeller lacks sufficient strength, durability, and impact resistance
Solution Approach 1:
The patent applies composite materials by combining negative Poisson's ratio (NPR) materials with positive Poisson's ratio (PPR) materials to create a hybrid propeller structure. The NPR material provides enhanced strength, durability, and impact resistance, while the PPR material contributes flexibility and traditional manufacturing compatibility. This composite approach resolves the contradiction by achieving superior mechanical properties without sacrificing reliability.
2Strength
If traditional PPR materials are used for propeller manufacturing, then the manufacturing process is straightforward, but the propeller weight is higher and strength-to-weight ratio is lower
Solution Approach 1:
The patent applies local quality by strategically positioning NPR material in specific regions of the propeller blade where high strength and impact resistance are most needed, such as the leading edge and root areas. The PPR material is used in regions where flexibility and weight reduction are prioritized. This localized material distribution optimizes the strength-to-weight ratio while maintaining overall propeller performance.
3Reliability
If NPR materials are used for propeller blades, then the propeller gains enhanced strength and impact resistance, but the manufacturing complexity increases due to combining multiple material types
Solution Approach 1:
The patent applies segmentation by dividing the propeller blade into distinct sections or layers, with NPR material applied to specific zones (such as the leading edge, root, or high-stress areas) and PPR material used in other regions. This segmented approach allows each material to be optimized for its specific function while simplifying the manufacturing process compared to requiring a entirely new complex material system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The NPR-PPR composite propellers exhibit improved strength, durability, and impact resistance, while being lighter in weight, thus enhancing operational efficiency and reducing material usage, making them suitable for various applications including aircraft, ships, wind turbines, and chemical processing.
Implementation Method 1
NPR materials are durable and weigh less than traditional manufacturing materials, and have an associated higher strength to weight ratio
Implementation Method 2
This type of material that combines NPR and PPR materials is a composite material referred to as a Boolean-Park (B-P) material
Data Source
AI summary
A propeller includes a rotatable hub and at least two propeller blades coupled to the rotatable hub. Each of the propeller blades is formed from a combination of a first material having a negative Poisson's ratio (NPR) and a second material having a positive Poisson's ratio (PPR). The first material and the second material can be layered or can be formed as a matrix with one of the first or second material embedded in the other. In a layered configuration, a layer of the first material is positioned between adjacent layers of the second material, and the layers can be connected by tabs of NPR material. The combination of the NPR and PPR materials improve the strength and impact resilience of the propeller blades compared to conventional materials.